Adding the ability to specify a custom rails root (i.e. in case you want
guard-rails to boot up a dummy app in an engine)
Adding example for :root option to README
Sorry for Rakefile derp. Didn't work for me but unrelated to my patch
Merge branch 'master' of pschyska/guard-rails

* 'master' of pschyska/guard-rails:
  Sorry for Rakefile derp. Didn't work for me but unrelated to my patch
  Adding example for :root option to README
  Adding the ability to specify a custom rails root (i.e. in case you want guard-rails to boot up a dummy app in an engine)

Conflicts:
	README.md
	lib/guard/rails/runner.rb